[photo-3d] Re: Chromostereopsis

[JNorman805@xxxxxxx]

Shab Levy writes:


> You can see an example of Chromatic Aberation/Chromostereopsis in
> illustration #5 at:
> 
> http://www.easystreet.com/~shab/Perception.htm
> 

Interesting. I first noticed this phenomenon about 5 years ago, just after I 
started messing around with stereo photography (using 2 taped-together 
disposables back then, but that's another story), and I was sensitized to a 
number of different means of provoking the perception of depth -- or, as it 
turns out in some cases, the MISperception of depth that isn't really there.  
One day, I happened to be standing on line for lunch at one of New York's 
outdoor shishkebab carts, and noticed that a brightly colored (yes, red and 
blue) sign appeared to be at different depth levels.  After determining that 
it was a flat-printed sign, and after pinching myself to make sure I wasn't 
"seeing things," I concluded that different colors must excite the eyes' 
receptor cells at different frequencies or rates, thus appear to be at 
different levels of depth.

A few years later, I received a pair of chromo-depth specs with one of Dan 
Shelley's CDs, and that piqued my interest in this phenomenon even more.  But 
what's interesting to me about Shab's example No. 6 (the stereo pair of the 
red and blue lines) is the following: (1) when I look at the lines without 
merging the two images into a stereo pair, just with my unaided eyes, the 
outer blue lines clearly stand out in front of the inner red lines, and (2) 
when I free view the pair to merge them into a stereo pair, the apparent 
depth difference between the blue and red lines disappears.  The red and blue 
lines appear to me to be at precisely the same depth level as each other.  
Yes, I know that the merged images are supposed to create a flat picture, 
without stereopsis, but I was surprised to see the chromostereoscopically 
inspired depth differential between the blue and the red lines disappear.

Does anyone else have this experience, or is it just me?



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